<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="root"></div>

  <input type="number" name="" id="num1">
  <input type="number" name="" id="num2">
  <button type="button">添加</button>
</body>
</html>